Chemical Engineering MCQs

Page No. 619

Which of the following achieves the least reduction ratio for a given feed size ?


aJaw crusher

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bRoll crusher

✓


cCone crusher

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dGyratory crusher

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View Answer Roll crusher

Size measurement of ultrafine particles can be best expressed in terms of___________________?


aCentimetre

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bScreen size

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cMicron

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dSurface area per unit mass

✓



Rittinger number which designates the new surface produced per unit of mechanical energy absorbed by the material being crushed, depends on the ______________________?


aState or manner of application of the crushing force

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bUltimate strength of the material

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cElastic constant of the material

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dAll A., B. and C.

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View Answer All A., B. and C.

During filtration operation, the filtrate encounters the resistance of the ___________________?


aFilter medium

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bCake

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cChannel carrying the slurry to the upstream side of the cake and filtrate away from the filter medium

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dAll A., B. and C.

✓


View Answer All A., B. and C.

_____________ is the most suitable for compounding rubber and plastic solids ?


aBanbury mixer

✓


bPan mixer

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cPug mill

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dCharge can mixer

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View Answer Banbury mixer

What is the reduction ratio in a fine crushing operation having following feed and product sizes ?


a0.5

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b2

✓


c5

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d10

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View Answer 2

For a sphere falling in the constant drag co-efficient regime, its terminal velocity depends on its diameter D. as_________________?


ad

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b√d

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cd2

✓


d1/d

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View Answer d2

For efficient grinding, ball mills must be operated__________________?


aAt a speed less than the critical speed

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bAt a speed more than the critical speed

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cAt a speed equal to the critical speed

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dWith minimum possible small balls

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Rittinger’s number designates the new surface created per unit mechanical energy absorbed by the material being crushed. Larger value of Rittinger’s number of a material indicates its________________?


aEasier grindability

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bPoor grindability

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cHigh power consumption in grinding

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dNone of these

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View Answer Easier grindability

Carbon black is pulverised in a_______________?


aHammer crusher

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bBall mill

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cRoll crusher

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dGyratory crusher

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View Answer Ball mill

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